[mpiwg-tools] Telecon this week?

Tue Sep 30 07:47:36 CDT 2014

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Hi all,

I hope I'll be able to join as well (though I'm technically on vacation).

I think the proposed changes for ticket 383 doesn't reflect what we
had in mind (or at least what I had in mind ;-)), and we should
discuss this very carefully - ideally with Martin as this affects all
tools which will support MPI_T.

My idea was, and maybe that wasn't clear from the discussions we had,
that on heterogeneous systems variables with the same name have the
same semantics, not only the processes in the same MPI_COMM_WORLD.
An example is the DEEP system (www.deep-project.eu), where we'll have
a cluster of Xeons and an attached cluster of Xeon Phis (a.k.a.
booster) , both running MPI and processes on the cluster should
offload kernels to the booster via MPI_COMM_SPAWN. Thus, the processes
on the cluster and those on the booster are connected.
Now I would like to ensure that variables with the same name are
required to have the same semantics across all processes, be it
cluster or booster, e.g. the eager limit or total network packages
sent (although there should be counters for the different network
interfaces). With the proposed changes to the ticket, this is no
longer guaranteed.

I think classifying the events in the library by MPI library versions
prevents that entirely, because in the case above, events with the
same name and semantics exist on the Xeons and the Xeon Phis, which
are classified differently.
If we go with the proposed addition of checking the MPI library
version string, my concern is that MPI implementations would opt for
the easy way and simply provide different version strings for the
libraries, which in the end  would result in the same mess.

My understanding is that MPI versions from different vendors can't
easily connect as there is no MPI ABI, so that the issue with two
independent libraries shouldn't be a major problem.

- -Michael

On 09/30/2014 11:01 AM, Schulz, Martin wrote:
> Yes, the notes are on the Wiki, but feel free to add if I forgot
> something.
>
> Sorry, I can’t make it on Thursday,
>
> Martin
>
>
>
> On 9/29/14, 6:34 PM, "Kathryn Mohror" <kathryn at llnl.gov> wrote:
>
>> Hi Marc-Andre,
>>
>> Great! I’m glad you can join too.
>>
>> Martin (thank you Martin!) put notes up on the wiki:
>> https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/MPI3Tools/notes-2014-09-
>>
>>
1
>> 5
>>
>> Kathryn
>> _________________________________________________________________
>>
>>
Kathryn Mohror, kathryn at llnl.gov, http://scalability.llnl.gov/
>> Scalability Team @ Lawrence Livermore National Laboratory,
>> Livermore, CA, USA
>>
>>
>>
>>
>>
>>
>> On 9/29/14, 9:29 AM, "Marc-Andre Hermanns"
>> <m.a.hermanns at grs-sim.de> wrote:
>>
>>> Hi Kathryn,
>>>
>>> I should be able to make it as well.
>>>
>>> @Martin: Do I recall correctly that you made some notes on the
>>> comments on the tool tickets? It would be great if you could
>>> mail them (to the list or Kathryn) beforehand. I would think
>>> along those notes we can reconstruct the discussion ;-)
>>>
>>> Cheers, Marc-Andre
>>>
>>> On 29.09.14 18:04, Kathryn Mohror wrote:
>>>> Yes, the usual time, 11am US Eastern, 8am US Pacific.
>>>>
>>>> Talk to you then! Kathryn
>>>> _________________________________________________________________
>>>>
>>>>
Kathryn Mohror, kathryn at llnl.gov, http://scalability.llnl.gov/
>>>> Scalability Team @ Lawrence Livermore National Laboratory,
>>>> Livermore, CA, USA
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On 9/29/14, 8:51 AM, "Jeff Squyres (jsquyres)"
>>>> <jsquyres at cisco.com> wrote:
>>>>
>>>>> That's Thursday at 11am US Eastern, right?
>>>>>
>>>>> If so, I should be able to be there.
>>>>>
>>>>>
>>>>>
>>>>> On Sep 29, 2014, at 11:05 AM, Mohror, Kathryn
>>>>> <mohror1 at llnl.gov> wrote:
>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> I¹m hoping to have our regular telecon this week to get
>>>>>> the details on what happened at the F2F in Japan. I know
>>>>>> Martin is on travel and won¹t be able to call in. Will
>>>>>> anyone who attended the forum meeting be able to join in?
>>>>>>
>>>>>>
>>>>>> Happy Monday! Kathryn
>>>>>> _________________________________________________________________
>>>>>>
>>>>>>
Kathryn Mohror, kathryn at llnl.gov, http://scalability.llnl.gov/
>>>>>> Scalability Team @ Lawrence Livermore National
>>>>>> Laboratory, Livermore, CA, USA
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> mpiwg-tools mailing list mpiwg-tools at lists.mpi-forum.org
>>>>>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-tools
>>>>>
>>>>>
>>>>>
>>>>>>
- --
>>>>> Jeff Squyres jsquyres at cisco.com For corporate legal
>>>>> information go to:
>>>>> http://www.cisco.com/web/about/doing_business/legal/cri/
>>>>>
>>>>> _______________________________________________ mpiwg-tools
>>>>> mailing list mpiwg-tools at lists.mpi-forum.org
>>>>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-tools
>>>>
>>>>
>>>>
>>>>>
_______________________________________________
>>>> mpiwg-tools mailing list mpiwg-tools at lists.mpi-forum.org
>>>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-tools
>>>>
>>>
>>> -- Marc-Andre Hermanns Jülich Aachen Research Alliance, High
>>> Performance Computing (JARA-HPC) German Research School for
>>> Simulation Sciences GmbH
>>>
>>> Schinkelstrasse 2 52062 Aachen Germany
>>>
>>> Phone: +49 241 80 99753 Fax: +49 241 80 6 99753
>>> www.grs-sim.de/parallel email: m.a.hermanns at grs-sim.de
>>>
>>
>>
>> _______________________________________________ mpiwg-tools
>> mailing list mpiwg-tools at lists.mpi-forum.org
>> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-tools
>
> _______________________________________________ mpiwg-tools mailing
> list mpiwg-tools at lists.mpi-forum.org
> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-tools
>

- --
Michael Knobloch
Institute for Advanced Simulation (IAS)
Jülich Supercomputing Centre (JSC)
Telefon: +49 2461 61-3546
Telefax: +49 2461 61-6656
E-Mail: m.knobloch at fz-juelich.de
Internet: http://www.fz-juelich.de/jsc
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